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SqlConnection con = DB.createConn();
SqlCommand cmd = con.CreateCommand();
cmd.Connection = con;
cmd.CommandType = CommandType.StoredProcedure;
cmd.CommandText = "train_no";
string train_no = "";//在这里赋值;
cmd.Parameters.Add("@tr_no", SqlDbType.VarChar, 8).Value = train_no;//train_no已经赋值
dataGridView1.DataSource = bindingSource1;
GetDate(cmd.CommandText);